Weird feeling

The last time I had sex was February 6, and he wore a condom and pulled out. Got on depo the 21st of March and since then I've had 3 periods that didn't seem normal but were periods. I've taken numerous pregnancy tests and the doctors gave me a urine test before giving me the shot and they've all came back negative. I have yet to get a positive. About a week ago I had anal, and last night there was some rough foreplay but never had sex. Now I know I'm just freaking myself out, because you can't get pregnant from anal or fingering/ dry humping. But I've got these fluttery "nervous" kind of feelings all over my stomach and I just don't know what to think so I need a little insight. Any would be amazing. Thanks, going into college this fall so I really don't need a baby.